CN110738206A - three-dimensional face polarized illumination and information acquisition system and method thereof - Google Patents
three-dimensional face polarized illumination and information acquisition system and method thereof Download PDFInfo
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- G06V10/10—Image acquisition
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Abstract
The invention relates to three-dimensional face polarization illumination and information acquisition systems and methods, which are used for achieving the purposes of eliminating the interference of ambient light and ensuring the stability and reliability of image quality by performing spatial modulation on the polarization degree of an electric vector of a light source signal, namely performing vector coding with higher fineness on a transmitting signal, and overcoming the problem that the image quality and the interference of the ambient light cannot be simultaneously solved in the prior art.
Description
Technical Field
The invention relates to face acquisition technologies, in particular to three-dimensional face polarized illumination and information acquisition systems and methods thereof.
Background
In image acquisition, in order to reflect the real information of an object as much as possible, a reasonable illumination mode is needed, and the intensity of constant light wave band is mostly detected by the existing imaging technology, and the acquisition is generally carried out by adopting two modes, namely 1, a light intensity modulation mode and a light-homogenizing illumination mode, namely, a light-homogenizing plate and other devices are adopted to ensure that the illumination is more uniform, and 2, an optical filter mode is adopted, namely, only object reflected light of a target light wave band is imaged, so that the ambient light outside constant pass band can be avoided.
However, in the two prior arts, the light intensity modulation and dodging lighting modes are greatly affected by ambient light, so that the influence of the ambient light is difficult to eliminate, and the problems of uniformity and stability of image quality in different scenes are difficult to overcome.
Disclosure of Invention
The invention aims to solve the problem that the image quality and the ambient light interference cannot be simultaneously solved in the prior art, and provides three-dimensional face polarized illumination and information acquisition systems and methods thereof.
In order to achieve the above purpose, the invention provides the following technical scheme:
three-dimensional face polarization illumination and information acquisition system, including polarized light source and acquisition imaging device;
the polarized light source adopts a cambered surface light source to provide polarized light for the target face, so that glare generated by diffuse reflection can be eliminated, the phenomenon of local illumination saturation of the collected image is eliminated, the sharpness of the image is greatly improved, and the overall contrast is increased;
the collecting imaging device is used for collecting polarized light information reflected by a human face, the collecting imaging device comprises a plurality of collecting cameras and an analyzer arranged in front of a lens of the collecting cameras, and the polarization degree of the analyzer is matched with that of the polarized light source.
Preferably, the polarized light source includes a light source plate, a light homogenizing diffusion plate and a polarizing plate, and light emitted from the light source plate is converted into uniform surface light by the light homogenizing diffusion plate and then converted into polarized light by the polarizing plate.
Preferably, the plurality of collection cameras adopt 5 collection cameras, and shoot images from the middle of the polarized light source and the positions of four corners respectively, because the target face is uneven three-dimensional objects, the 5 directions collect, so that the collected face image is more comprehensive and stereoscopic, and a collection blind area cannot be formed.
Preferably, the analyzer further comprises a micro-motor, the analyzer is driven by the micro-motor to rotate around the center of the optical axis of the collecting camera at a constant speed, and the collected images are continuously shot to form series of homogeneous images which have target polarization information and continuously change the gray levels among the images.
Preferably, the polarization analyzer further comprises a control terminal, and the control terminal is used for controlling the rotation of the polarization analyzer and receiving the image information collected by the collecting camera.
Preferably, the system further comprises grating projectors respectively arranged in the middle of the left side and the right side of the polarized light source, the grating projectors are used for projecting sinusoidal gratings and providing data for calculating the spatial position of a target face, and the grating projectors adopt variable grating projectors.
Preferably, the analyzer uses the polarizer.
A method for three-dimensional face polarized illumination and information acquisition, comprising the following steps:
, emitting polarized light to the target human face from cambered surfaces to obtain polarized light information reflected by the human face;
step two: and collecting polarized light information reflected by the human face at the center and four corners on the cambered surface, and filtering ambient light reflected by the human face.
Preferably, the method further comprises a third step;
and step three, continuously adjusting the filtered polarization angle to enable the collected images to form series of homogeneous images with target polarization information and continuously changing gray levels among the images.
Preferably, the method further comprises a fourth step;
step four: and projecting a sinusoidal grating to the target face, collecting the reflected sinusoidal grating information, and providing data support for calculating the spatial position of the target face.
Compared with the prior art, the invention has the beneficial effects that:
the polarized light source is adopted for polarized light illumination, the interference of ambient light is greatly reduced (the interference of the ambient light can be reduced by at least 50%), the signal to noise ratio is improved, the illumination light information is completely controllable, although the polarization degree is reduced after the target is reflected, the more important effect is that the glare generated by diffuse reflection can be eliminated, the phenomenon of local illumination saturation of the collected image is eliminated, the sharpness of the image is greatly improved, the overall contrast is increased, the reduction and instability of the image quality caused by the difference and the transformation of the external illumination environment in the process are eliminated, and the stability of the recognition algorithm can be further improved in step .
Adopt 5 and gather the camera, and shoot the image from the centre of polarized light source and the position of four corners respectively, make the face image of gathering more comprehensive three-dimensional, because the face is inhomogeneous three-dimensional objects, there is definite side direction angle, the camera of gathering too seldom can be because the adverse effect that the inhomogeneous and facial fluctuation of ambient light caused facial formation of image, lead to the information of gathering not comprehensive, can also influence the concatenation process of image, gather camera too much and then can cause unnecessary waste, adopt the five-point position that is fit for facial to gather the target face from 5 angles respectively and can make the proportion of image more reasonable, when gathering camera benchmark value measurement in the middle, also can cooperate with two camera, the degree of difficulty in the aspect of image concatenation has been reduced, the quality that the edge of picture concatenation fuses has obviously been improved.
The grating projector is adopted, so that a sinusoidal grating can be projected, and the sinusoidal grating contains phase information and can be used for calculating the space depth of a target face.
The analyzer installed in front of the camera lens can be driven by a micro-motor to rotate at a constant speed and center, can continuously shoot series relevant pictures with target polarization information and illuminance I meeting I (cos theta) 2 (theta is an included angle between a polarizer and the polarization direction of the analyzer), and the group pictures are homogeneous images with continuously changed gray levels.
Drawings
FIG. 1 is a schematic diagram of the skin surface reflected scattered light
FIG. 2 is a schematic diagram of natural light passing through an analyzer
Fig. 3 is a schematic top view of three-dimensional face polarization illumination and information acquisition systems according to embodiment 1.
Fig. 4 is a schematic diagram of an oblique two-view structure of three-dimensional face polarized illumination and information acquisition systems according to embodiment 3.
Fig. 5 is a schematic flow chart of methods for three-dimensional face polarized illumination and information acquisition according to embodiment 4.
Fig. 6 is a schematic flow chart of methods for three-dimensional face polarized illumination and information acquisition according to embodiment 5.
The labels in the figure are: 1-target face, 2-light source plate, 3-uniform light diffusion plate, 4-polaroid, 5-A collecting camera, 6-B collecting camera, 7-C collecting camera, 8-D collecting camera, 9-E collecting camera, 10-analyzer and 11-grating projector.
Detailed Description
The present invention will be described in further detail in with reference to test examples and specific embodiments, but it should not be construed that the scope of the above subject matter of the present invention is limited to the following examples, and that all the technologies realized based on the present invention are within the scope of the present invention.
The invention carries out spatial modulation on the polarization degree of the electric vector of the light source signal, thereby equivalently carrying out vector coding with finer precision on the emission signal, and being different from illumination modulation like .
In the invention, because the polarized light target applied by illumination is skin, the surface structure of the polarized light target is relatively complex, the light reflected back to the camera can not be ensured to be still linearly polarized, the light reflected back to the camera is relatively fixed to the polarized component in the direction determined by the target surface , a polarized image can still be extracted, part of ambient light can supplement the large-angle illumination of the polarized light source in imaging, the image quality sharpness is improved, and the like, and the omnibearing target information is acquired.
As shown in FIG. 1, the reflection and scattering of the surface is determined by the quality of the microscopic surface, which is about 1, the light 1 is specular reflection on a relatively smooth surface and can maintain a good polarization state, 2, the light 2 is relatively complicated to reflect near the center of a pit such as a pore and has random directions and polarization states, 3, the light 3 has a good polarization state but random directions at skin textures, 4, the light 4 has random polarization states on particles and has a large intensity in the main reflection direction, and 5, the light 5 has a weak effect on image plane information when the incident light is large on micro-planes.
As shown in fig. 2, the horizontal straight line in the drawing represents the light propagation direction, the dots represent the light vibration perpendicular to the paper surface, and the arrow lines represent the parallel optical axis and the light vibration direction on the paper surface, the background light is the environment light which can be regarded as random polarized light, the polarized light in all directions can be decomposed into two orthogonal directions, the analyzer can stably filter environment light with half intensity in any state, and the strong reflection glare in a certain fixed direction can be greatly eliminated.
The method includes the steps that 5 cameras are adopted to collect images from the center of a polarized light source and the positions of four corners, and the symmetrical structure of a collected face is mainly considered 1. when external environment light is not uniform, particularly under the condition of side light, the difference distribution of regional illumination conditions of image surfaces on two sides of a nose bridge can cause loss of high-frequency signals expressing surface details, two side cameras are arranged, meanwhile, due to polarized illumination, partial polarization loss can be caused on the texture of the skin surface, the area and the probability of the light of adjacent polarization scattering plates can be increased due to the fact that the cameras are arranged on two sides, 2. due to the fact that the convex parts of cheeks mostly become highlight areas, if the two sides are in direct alignment imaging, the overall uniformity of exposure can be affected, two cameras symmetrically and equally inclined along the horizontal plane are arranged on the upper side and the lower side of the two sides, is provided, the side angle is determined, the adverse effect on the face imaging caused by the non-uniformity of the environment light and the fluctuation of the face can be avoided, the problem on the image splicing can be affected, and the problem on the splicing of the image can be introduced.
According to the polarized light illumination image acquisition system in the design, the analyzer can be controlled to acquire images when rotating to a specific position, and surface information of more target images can be obtained by utilizing the feature extraction and related algorithms of the polarized images.
The specific embodiment is as follows:
example 1:
as shown in fig. 3, three-dimensional face polarization illumination and information acquisition systems comprise a polarized light source, an a acquisition camera 5, a B acquisition camera 6, a C acquisition camera 7, a D acquisition camera 8, an E acquisition camera 9, and an analyzer 10 in front of the lens of each acquisition camera.
The polarized light source adopts cambered surface illumination, the longitudinal line nose bridge of the central line of the face of a target face 1 is used as a boundary edge collected by a left camera and a right camera, the illumination angle of the same part is expanded by illumination, so that the polarized light from a wider angle in the light from the same part in imaging can be collected as much as possible, the polarized light source consists of a light source plate 2, a light homogenizing and diffusing plate 3 and a polarizing plate 4, the light source plate 2 provides illumination, the emergent light of the light source plate 2 is processed by the light homogenizing and diffusing plate 3 to form plane light parallel to the cambered surface, and the polarized light illumination is carried out on the target face 1 after the emergent light is polarized by the polarizing plate 4, an analyzer 10 in front of the lens of each collecting camera is used for analyzing the polarized light reflected by the target face 1 and then collected by the corresponding collecting camera, the installation direction of the polarizing plate is the same as the influence of the ambient light on the target, the illumination angle and the position relation of the receiving camera and the illuminating plate, the polarizing plate is arranged at the initial position of the polarizing plate 4 (the polarizing plate), namely the polarizing axis is parallel to the polarizing axis, and the polarizing plate can receive the most.
Example 2:
the difference between this embodiment and embodiment 1 is that the apparatus further includes control terminals, and the analyzer in front of the lens of each collecting camera further includes micro-analyzersThe control terminal is used for controlling the working state of the micromotor and receiving the image information collected by the collecting camera, the analyzer is driven by the micromotor and can rotate around the center of the optical axis of the collecting camera at a constant speed (the rotating speed omega of the analyzer is adjustable, and the polarization included angle is formed under the drive of the micromotor
The control terminal can receive the driving parameters of the micromotor), and continuous shooting is carried out so that the collected images form series of correlation photos with target polarization information, and meanwhile, the illumination intensity of the photos accords with I (cos theta) 2 (theta is an included angle between the polarization direction of the polarizer and the polarization direction of the analyzer), and the photos are homogeneous images with continuously changed gray levels among the group images.
Example 3:
as shown in fig. 4, the present embodiment is different from embodiment 1 in that grating projectors 11 are respectively disposed on the left and right sides of the polarized light source, and the grating projectors 11 can project sinusoidal gratings containing phase information, which can be used to calculate the spatial depth of a target face.
Example 4:
as shown in fig. 5, methods for three-dimensional face polarized illumination and information acquisition comprise the following steps:
, emitting polarized light to the target face by using a cambered surface light source after polarization treatment;
step two: collecting polarized light information reflected by the face at the center and four corners of the cambered surface, and filtering ambient light reflected by the face;
example 5:
as shown in fig. 6, the present embodiment is different from embodiment 4 in that it further includes a third step,
and step three, continuously adjusting the filtered polarization angle to acquire images to form series of homogeneous images with target polarization information and continuously changing gray levels among the images.
Example 6:
the difference between this embodiment and embodiment 4 is that it further comprises a fourth step,
step four: and projecting a sinusoidal grating containing phase information to the target face, and collecting reflected grating information to provide data support for calculating the spatial position of the target face.
Claims (10)
1, three-dimensional face polarization illumination and information acquisition system, which is characterized in that the system comprises a polarized light source and an acquisition imaging device;
the polarized light source adopts a cambered surface light source to provide polarized light illumination for the target face (1);
the collecting imaging device is used for collecting polarized light information reflected by a human face, the collecting imaging device comprises a plurality of collecting cameras and an analyzer (10) arranged in front of a lens of the collecting cameras, and the polarization degree of the analyzer (10) is matched with that of the polarized light source.
2. The kind of three-dimensional face polarization illumination and information collection system of claim 1, wherein the polarized light source comprises a light source board (2), a light homogenizing and diffusing board (3) and a polarizer (4), the light emitted from the light source board (2) is converted into uniform face light by the light homogenizing and diffusing board (3) and then converted into polarized light by the polarizer (4).
3. The kind of three-dimensional face polarization illumination and information acquisition system of claim 1, wherein said multiple acquisition cameras use 5 acquisition cameras and take images from the center and four corners of said polarized light source respectively.
4. The kinds of three-dimensional face polarization illumination and information acquisition system of claim 1, wherein the analyzer (8) further comprises a micro-motor, and the analyzer (8) is driven by the micro-motor to rotate around the optical axis center of the acquisition camera at a constant speed.
5. The kinds of three-dimensional face polarization illumination and information acquisition system of claim 4, further comprising a control terminal for controlling the rotation of the analyzer and receiving the image information acquired by the acquisition camera.
6. The kind of three-dimensional face polarization illumination and information acquisition system of claim 1, further comprising grating projectors (11) respectively disposed in the middle of the left and right sides of the polarized light source, wherein the grating projectors (11) are used for projecting sinusoidal gratings to provide data for calculating the spatial position of the target face, and the grating projectors (11) employ variable grating projectors.
7. The kind of three-dimensional face polarization illumination and information collection system of claim 2, wherein the analyzer (8) employs the polarizer (4).
8, A method for polarized illumination and information collection of three-dimensional human face, the method comprises the following steps:
, emitting polarized light to the target human face from cambered surfaces to obtain polarized light information reflected by the human face;
step two: and collecting polarized light information reflected by the human face at the center and four corners on the cambered surface, and filtering ambient light reflected by the human face.
9. The method for polarized illumination and information collection of claim 8, further comprising the steps of III;
and step three, continuously adjusting the filtered polarization angle to enable the collected images to form series of homogeneous images with target polarization information and continuously changing gray levels among the images.
10. The method for polarized illumination and information collection of claim 8, further comprising the steps of four;
step four: and projecting a sinusoidal grating to the target face, collecting the reflected sinusoidal grating information, and providing data support for calculating the spatial position of the target face.
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